| // WARNING in reconnect_path |
| // https://syzkaller.appspot.com/bug?id=bbde637dbd6e5b0e87dc04ed949c89c799d133a8 |
| // status:open |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <arpa/inet.h> |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <net/if.h> |
| #include <netinet/in.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include <linux/capability.h> |
| #include <linux/genetlink.h> |
| #include <linux/if_addr.h> |
| #include <linux/if_link.h> |
| #include <linux/in6.h> |
| #include <linux/neighbour.h> |
| #include <linux/net.h> |
| #include <linux/netlink.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/veth.h> |
| |
| static void sleep_ms(uint64_t ms) |
| { |
| usleep(ms * 1000); |
| } |
| |
| static uint64_t current_time_ms(void) |
| { |
| struct timespec ts; |
| if (clock_gettime(CLOCK_MONOTONIC, &ts)) |
| exit(1); |
| return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; |
| } |
| |
| static bool write_file(const char* file, const char* what, ...) |
| { |
| char buf[1024]; |
| va_list args; |
| va_start(args, what); |
| vsnprintf(buf, sizeof(buf), what, args); |
| va_end(args); |
| buf[sizeof(buf) - 1] = 0; |
| int len = strlen(buf); |
| int fd = open(file, O_WRONLY | O_CLOEXEC); |
| if (fd == -1) |
| return false; |
| if (write(fd, buf, len) != len) { |
| int err = errno; |
| close(fd); |
| errno = err; |
| return false; |
| } |
| close(fd); |
| return true; |
| } |
| |
| struct nlmsg { |
| char* pos; |
| int nesting; |
| struct nlattr* nested[8]; |
| char buf[1024]; |
| }; |
| |
| static struct nlmsg nlmsg; |
| |
| static void netlink_init(struct nlmsg* nlmsg, int typ, int flags, |
| const void* data, int size) |
| { |
| memset(nlmsg, 0, sizeof(*nlmsg)); |
| struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; |
| hdr->nlmsg_type = typ; |
| hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags; |
| memcpy(hdr + 1, data, size); |
| nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size); |
| } |
| |
| static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data, |
| int size) |
| { |
| struct nlattr* attr = (struct nlattr*)nlmsg->pos; |
| attr->nla_len = sizeof(*attr) + size; |
| attr->nla_type = typ; |
| memcpy(attr + 1, data, size); |
| nlmsg->pos += NLMSG_ALIGN(attr->nla_len); |
| } |
| |
| static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type, |
| int* reply_len) |
| { |
| if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting) |
| exit(1); |
| struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; |
| hdr->nlmsg_len = nlmsg->pos - nlmsg->buf; |
| struct sockaddr_nl addr; |
| memset(&addr, 0, sizeof(addr)); |
| addr.nl_family = AF_NETLINK; |
| unsigned n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0, |
| (struct sockaddr*)&addr, sizeof(addr)); |
| if (n != hdr->nlmsg_len) |
| exit(1); |
| n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); |
| if (hdr->nlmsg_type == NLMSG_DONE) { |
| *reply_len = 0; |
| return 0; |
| } |
| if (n < sizeof(struct nlmsghdr)) |
| exit(1); |
| if (reply_len && hdr->nlmsg_type == reply_type) { |
| *reply_len = n; |
| return 0; |
| } |
| if (n < sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr)) |
| exit(1); |
| if (hdr->nlmsg_type != NLMSG_ERROR) |
| exit(1); |
| return -((struct nlmsgerr*)(hdr + 1))->error; |
| } |
| |
| static int netlink_send(struct nlmsg* nlmsg, int sock) |
| { |
| return netlink_send_ext(nlmsg, sock, 0, NULL); |
| } |
| |
| static int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset, |
| unsigned int total_len) |
| { |
| struct nlmsghdr* hdr = (struct nlmsghdr*)(nlmsg->buf + offset); |
| if (offset == total_len || offset + hdr->nlmsg_len > total_len) |
| return -1; |
| return hdr->nlmsg_len; |
| } |
| |
| static void netlink_device_change(struct nlmsg* nlmsg, int sock, |
| const char* name, bool up, const char* master, |
| const void* mac, int macsize, |
| const char* new_name) |
| { |
| struct ifinfomsg hdr; |
| memset(&hdr, 0, sizeof(hdr)); |
| if (up) |
| hdr.ifi_flags = hdr.ifi_change = IFF_UP; |
| hdr.ifi_index = if_nametoindex(name); |
| netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr)); |
| if (new_name) |
| netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name)); |
| if (master) { |
| int ifindex = if_nametoindex(master); |
| netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex)); |
| } |
| if (macsize) |
| netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize); |
| int err = netlink_send(nlmsg, sock); |
| (void)err; |
| } |
| |
| const int kInitNetNsFd = 239; |
| |
| #define DEVLINK_FAMILY_NAME "devlink" |
| |
| #define DEVLINK_CMD_PORT_GET 5 |
| #define DEVLINK_CMD_RELOAD 37 |
| #define DEVLINK_ATTR_BUS_NAME 1 |
| #define DEVLINK_ATTR_DEV_NAME 2 |
| #define DEVLINK_ATTR_NETDEV_NAME 7 |
| #define DEVLINK_ATTR_NETNS_FD 137 |
| |
| static int netlink_devlink_id_get(struct nlmsg* nlmsg, int sock) |
| { |
| struct genlmsghdr genlhdr; |
| struct nlattr* attr; |
| int err, n; |
| uint16_t id = 0; |
| memset(&genlhdr, 0, sizeof(genlhdr)); |
| genlhdr.cmd = CTRL_CMD_GETFAMILY; |
| netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr)); |
| netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, DEVLINK_FAMILY_NAME, |
| strlen(DEVLINK_FAMILY_NAME) + 1); |
| err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n); |
| if (err) { |
| return -1; |
| } |
| attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN + |
| NLMSG_ALIGN(sizeof(genlhdr))); |
| for (; (char*)attr < nlmsg->buf + n; |
| attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { |
| if (attr->nla_type == CTRL_ATTR_FAMILY_ID) { |
| id = *(uint16_t*)(attr + 1); |
| break; |
| } |
| } |
| if (!id) { |
| return -1; |
| } |
| recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); /* recv ack */ |
| return id; |
| } |
| |
| static void netlink_devlink_netns_move(const char* bus_name, |
| const char* dev_name, int netns_fd) |
| { |
| struct genlmsghdr genlhdr; |
| int sock; |
| int id; |
| sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); |
| if (sock == -1) |
| exit(1); |
| id = netlink_devlink_id_get(&nlmsg, sock); |
| if (id == -1) |
| goto error; |
| memset(&genlhdr, 0, sizeof(genlhdr)); |
| genlhdr.cmd = DEVLINK_CMD_RELOAD; |
| netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr)); |
| netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1); |
| netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1); |
| netlink_attr(&nlmsg, DEVLINK_ATTR_NETNS_FD, &netns_fd, sizeof(netns_fd)); |
| netlink_send(&nlmsg, sock); |
| error: |
| close(sock); |
| } |
| |
| static struct nlmsg nlmsg2; |
| |
| static void initialize_devlink_ports(const char* bus_name, const char* dev_name, |
| const char* netdev_prefix) |
| { |
| struct genlmsghdr genlhdr; |
| int len, total_len, id, err, offset; |
| uint16_t netdev_index; |
| int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); |
| if (sock == -1) |
| exit(1); |
| int rtsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
| if (rtsock == -1) |
| exit(1); |
| id = netlink_devlink_id_get(&nlmsg, sock); |
| if (id == -1) |
| goto error; |
| memset(&genlhdr, 0, sizeof(genlhdr)); |
| genlhdr.cmd = DEVLINK_CMD_PORT_GET; |
| netlink_init(&nlmsg, id, NLM_F_DUMP, &genlhdr, sizeof(genlhdr)); |
| netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1); |
| netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1); |
| err = netlink_send_ext(&nlmsg, sock, id, &total_len); |
| if (err) { |
| goto error; |
| } |
| offset = 0; |
| netdev_index = 0; |
| while ((len = netlink_next_msg(&nlmsg, offset, total_len)) != -1) { |
| struct nlattr* attr = (struct nlattr*)(nlmsg.buf + offset + NLMSG_HDRLEN + |
| NLMSG_ALIGN(sizeof(genlhdr))); |
| for (; (char*)attr < nlmsg.buf + offset + len; |
| attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { |
| if (attr->nla_type == DEVLINK_ATTR_NETDEV_NAME) { |
| char* port_name; |
| char netdev_name[IFNAMSIZ]; |
| port_name = (char*)(attr + 1); |
| snprintf(netdev_name, sizeof(netdev_name), "%s%d", netdev_prefix, |
| netdev_index); |
| netlink_device_change(&nlmsg2, rtsock, port_name, true, 0, 0, 0, |
| netdev_name); |
| break; |
| } |
| } |
| offset += len; |
| netdev_index++; |
| } |
| error: |
| close(rtsock); |
| close(sock); |
| } |
| |
| static void initialize_devlink_pci(void) |
| { |
| int netns = open("/proc/self/ns/net", O_RDONLY); |
| if (netns == -1) |
| exit(1); |
| int ret = setns(kInitNetNsFd, 0); |
| if (ret == -1) |
| exit(1); |
| netlink_devlink_netns_move("pci", "0000:00:10.0", netns); |
| ret = setns(netns, 0); |
| if (ret == -1) |
| exit(1); |
| close(netns); |
| initialize_devlink_ports("pci", "0000:00:10.0", "netpci"); |
| } |
| |
| #define MAX_FDS 30 |
| |
| static void setup_common() |
| { |
| if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { |
| } |
| } |
| |
| static void loop(); |
| |
| static void sandbox_common() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| setsid(); |
| int netns = open("/proc/self/ns/net", O_RDONLY); |
| if (netns == -1) |
| exit(1); |
| if (dup2(netns, kInitNetNsFd) < 0) |
| exit(1); |
| close(netns); |
| struct rlimit rlim; |
| rlim.rlim_cur = rlim.rlim_max = (200 << 20); |
| setrlimit(RLIMIT_AS, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 32 << 20; |
| setrlimit(RLIMIT_MEMLOCK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 136 << 20; |
| setrlimit(RLIMIT_FSIZE, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 1 << 20; |
| setrlimit(RLIMIT_STACK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 0; |
| setrlimit(RLIMIT_CORE, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 256; |
| setrlimit(RLIMIT_NOFILE, &rlim); |
| if (unshare(CLONE_NEWNS)) { |
| } |
| if (unshare(CLONE_NEWIPC)) { |
| } |
| if (unshare(0x02000000)) { |
| } |
| if (unshare(CLONE_NEWUTS)) { |
| } |
| if (unshare(CLONE_SYSVSEM)) { |
| } |
| typedef struct { |
| const char* name; |
| const char* value; |
| } sysctl_t; |
| static const sysctl_t sysctls[] = { |
| {"/proc/sys/kernel/shmmax", "16777216"}, |
| {"/proc/sys/kernel/shmall", "536870912"}, |
| {"/proc/sys/kernel/shmmni", "1024"}, |
| {"/proc/sys/kernel/msgmax", "8192"}, |
| {"/proc/sys/kernel/msgmni", "1024"}, |
| {"/proc/sys/kernel/msgmnb", "1024"}, |
| {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, |
| }; |
| unsigned i; |
| for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) |
| write_file(sysctls[i].name, sysctls[i].value); |
| } |
| |
| int wait_for_loop(int pid) |
| { |
| if (pid < 0) |
| exit(1); |
| int status = 0; |
| while (waitpid(-1, &status, __WALL) != pid) { |
| } |
| return WEXITSTATUS(status); |
| } |
| |
| static void drop_caps(void) |
| { |
| struct __user_cap_header_struct cap_hdr = {}; |
| struct __user_cap_data_struct cap_data[2] = {}; |
| cap_hdr.version = _LINUX_CAPABILITY_VERSION_3; |
| cap_hdr.pid = getpid(); |
| if (syscall(SYS_capget, &cap_hdr, &cap_data)) |
| exit(1); |
| const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE); |
| cap_data[0].effective &= ~drop; |
| cap_data[0].permitted &= ~drop; |
| cap_data[0].inheritable &= ~drop; |
| if (syscall(SYS_capset, &cap_hdr, &cap_data)) |
| exit(1); |
| } |
| |
| static int do_sandbox_none(void) |
| { |
| if (unshare(CLONE_NEWPID)) { |
| } |
| int pid = fork(); |
| if (pid != 0) |
| return wait_for_loop(pid); |
| setup_common(); |
| sandbox_common(); |
| drop_caps(); |
| if (unshare(CLONE_NEWNET)) { |
| } |
| initialize_devlink_pci(); |
| loop(); |
| exit(1); |
| } |
| |
| static int inject_fault(int nth) |
| { |
| int fd; |
| fd = open("/proc/thread-self/fail-nth", O_RDWR); |
| if (fd == -1) |
| exit(1); |
| char buf[16]; |
| sprintf(buf, "%d", nth + 1); |
| if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) |
| exit(1); |
| return fd; |
| } |
| |
| static void kill_and_wait(int pid, int* status) |
| { |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| int i; |
| for (i = 0; i < 100; i++) { |
| if (waitpid(-1, status, WNOHANG | __WALL) == pid) |
| return; |
| usleep(1000); |
| } |
| DIR* dir = opendir("/sys/fs/fuse/connections"); |
| if (dir) { |
| for (;;) { |
| struct dirent* ent = readdir(dir); |
| if (!ent) |
| break; |
| if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) |
| continue; |
| char abort[300]; |
| snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", |
| ent->d_name); |
| int fd = open(abort, O_WRONLY); |
| if (fd == -1) { |
| continue; |
| } |
| if (write(fd, abort, 1) < 0) { |
| } |
| close(fd); |
| } |
| closedir(dir); |
| } else { |
| } |
| while (waitpid(-1, status, __WALL) != pid) { |
| } |
| } |
| |
| static void setup_test() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| write_file("/proc/self/oom_score_adj", "1000"); |
| } |
| |
| static void close_fds() |
| { |
| int fd; |
| for (fd = 3; fd < MAX_FDS; fd++) |
| close(fd); |
| } |
| |
| static void setup_fault() |
| { |
| static struct { |
| const char* file; |
| const char* val; |
| bool fatal; |
| } files[] = { |
| {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true}, |
| {"/sys/kernel/debug/fail_futex/ignore-private", "N", false}, |
| {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false}, |
| {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false}, |
| {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false}, |
| }; |
| unsigned i; |
| for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) { |
| if (!write_file(files[i].file, files[i].val)) { |
| if (files[i].fatal) |
| exit(1); |
| } |
| } |
| } |
| |
| static void execute_one(void); |
| |
| #define WAIT_FLAGS __WALL |
| |
| static void loop(void) |
| { |
| int iter; |
| for (iter = 0;; iter++) { |
| int pid = fork(); |
| if (pid < 0) |
| exit(1); |
| if (pid == 0) { |
| setup_test(); |
| execute_one(); |
| close_fds(); |
| exit(0); |
| } |
| int status = 0; |
| uint64_t start = current_time_ms(); |
| for (;;) { |
| if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) |
| break; |
| sleep_ms(1); |
| if (current_time_ms() - start < 5 * 1000) |
| continue; |
| kill_and_wait(pid, &status); |
| break; |
| } |
| } |
| } |
| |
| void execute_one(void) |
| { |
| *(uint32_t*)0x20000000 = 9; |
| *(uint32_t*)0x20000004 = 1; |
| memcpy((void*)0x20000008, "\x0f", 1); |
| inject_fault(18); |
| syscall(__NR_open_by_handle_at, 0xffffff9c, 0x20000000ul, 0x400000ul); |
| } |
| int main(void) |
| { |
| inject_fault(18); |
| syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0); |
| setup_fault(); |
| do_sandbox_none(); |
| return 0; |
| } |